Switching to llvm source based coverage.#385
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thirtytwobits merged 3 commits into3.0.previewfrom Dec 19, 2025
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Pull request overview
This PR migrates the C/C++ code coverage infrastructure from lcov/genhtml-based coverage to LLVM source-based code coverage, providing more accurate and modern coverage reporting capabilities.
Key Changes:
- Replaces lcov/genhtml toolchain with LLVM's source-based coverage tools (llvm-cov and llvm-profdata)
- Integrates CTest for test discovery and execution
- Adds comprehensive test presets for different configurations
Reviewed changes
Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| verification/cmake/utils.cmake | Removes deprecated define_native_test_run function no longer needed with CTest integration |
| verification/cmake/modules/Findverification-coverage.cmake | Completely rewritten to find LLVM coverage tools (llvm-cov, llvm-profdata) instead of lcov |
| verification/cmake/modules/Findgenhtml.cmake | Entire file deleted as genhtml is replaced by llvm-cov for HTML report generation |
| verification/cmake/compiler_flag_sets/common.cmake | Updates coverage compiler/linker flags to use LLVM instrumentation (-fprofile-instr-generate, -fcoverage-mapping) instead of gcov flags |
| verification/CMakePresetsVendorTemplate.json | Changes build targets from "test_all" to "all" and removes redundant workflow metadata |
| verification/CMakePresets.json | Changes all build targets from "test_all" to "all", removes redundant workflow display names/descriptions, adds 6 new test presets for CTest integration |
| verification/CMakeLists.txt | Major refactoring: enables CTest, renames functions (runTestCpp→compileTestCpp, runTestC→compileTestC), removes lcov-based coverage in favor of LLVM coverage pipeline with profdata merging and multi-format report generation |
| CONTRIBUTING.rst | Updates documentation to explain LLVM coverage workflow, output locations, and commands |
| .vscode/settings.json | Adds SonarLint connected mode configuration |
| .vscode/extensions.json | Removes deprecated Catch2 test adapter extension |
| .github/workflows/test.yml | Updates coverage artifact paths and container image version to ts24.4.3 |
| .devcontainer/toolshed-cov-arm64/devcontainer.json | Entire file deleted - coverage-specific devcontainer no longer needed |
| .devcontainer/toolshed-cov-amd64/devcontainer.json | Entire file deleted - coverage-specific devcontainer no longer needed |
| .devcontainer/toolshed-arm64/devcontainer.json | Removes Catch2 test adapter extension |
| .devcontainer/toolshed-amd64/devcontainer.json | Removes Catch2 test adapter extension |
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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@thirtytwobits I've opened a new pull request, #386, to work on those changes. Once the pull request is ready, I'll request review from you. |
Addresses feedback from #385 to use the CMake variable found by `Findverification-coverage.cmake` instead of hardcoding the tool name. ## Changes - Pass `LLVM_COV` to generated coverage script via `set(LLVM_COV "${LLVM_COV}")` - Replace hardcoded `llvm-cov` with `\${LLVM_COV}` in all `execute_process()` commands (4 occurrences) This matches the existing pattern for `LLVM_PROFDATA` and ensures the build uses the tool path discovered by CMake's find_program() rather than assuming it's in PATH. ```cmake # Before execute_process( COMMAND llvm-cov show -format=html ... ) # After execute_process( COMMAND \${LLVM_COV} show -format=html ... ) ``` <!-- START COPILOT CODING AGENT TIPS --> --- 💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more [Copilot coding agent tips](https://gh.io/copilot-coding-agent-tips) in the docs. --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: thirtytwobits <19180861+thirtytwobits@users.noreply.github.com>
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A much better way to generate source coverage for C++